Defensive publication

ABSTRACT

LOW CONCENTRATIONS OF CERTAIN QUATERNED TRINUCLEAR COMPLEX CYANINE I, TRINUCLEAR COMPLEX MEROCYANINE II AND QUATERNATED TETRANUCLEAR COMPLEX CYANINE DYES III CHEMICALLY SENSITIZE FINE GRAIN SILVER HALIDE PHOTOGRAPHIC EMULSIONS HAVING AN AVERAGE GRAIN SIZE LESS THAN ABOUT 0.3 MICRON, THE EFFECT IS OBTAINED WITH CONCENTRATION OF THE DYES WELL BELOW THE EFFECTIVE SPECTRAL SENSITIZING CONCENTRATIONS, E.G., OF THE ORDER OF 0.1. TO 25 MG. OF DYE PER MOLE OF SILVER HALIDE. EXAMPLES OF THE DYES INCLUDE:   WHEN I, II OR III IS ADDED IN AMOUNTS OF 1.0 MG./MOLE AG TO A FINE GRAIN (0.2$) CUBIC SILVER BROMOIODIDE GELATIN EMULSION WHICH IS GOLD AND SULFUR SENSITIZED AND THE EMULSION IS COATED ON CELLULOSE ACETATE FILM SUPPORT AT 400 MG. AG/FT.2 AND 400 MG. GELATIN/FT.2, AN INCREASE IN BLUE SPEED WITHOUT SUBSTANTIAL SPECTRAL SENSITIZATION IS OBSERVED.

DEFENSIVE PUBLICATION UNITED STATES PATENT OFFICE Published at therequest of the applicant or owner in accordance with the Notice of Dec.16, 1969, 869 O.G. 687. The abstracts of Defensive Publicationapplications are identified by distinctly numbered series and arearranged chronologically. The heading of each abstract indicates thenumber of pages of specification. including claims and sheets ofdrawings contained in the application as originally filed. The files ofthese applications are available to the public for inspection andreproduction may be purchased for 30 cents a sheet.

Defensive Publication applications have not been examined as to themerits of alleged invention. The Patent Ofiice makes no assertion as tothe novelty of the disclosed subject matter.

PUBLISHED FEBRUARY 2, 1971 T883,017 PHOTOGRAPHIC SILVER HALIDE MATERIALSCONTAINING CYANINE DYES AS CHEMICAL SENSI'IIZERS Cynthia Geer Ulbing,Kodak Park Works, 1669 Lake Ave.,

Rochester, N.Y. 14650 Filed June 29, 1970, Ser. No. 51,021 Int. Cl. G03cN28 US. Cl. 96-107 No Drawing. 20 Pages Specification Low concentrationsof certain quaterned trinuclear complex cyanine I, trinuclear complexmerocyanine II and quaternated tetranuclear complex cyanine dyes IIIchemically sensitize fine grain silver halide photographic emulsionshaving an average grain size less than about 0.3 micron. The effect isobtained with concentrations of the dyes well below the effectivespectral sensitizing concentrations, e.g., of the order of 0.1 to 25 mg.of dye per mole of silver halide. Examples of the dyes include:

When I, 11 or III is added in amounts of 1.0 mg./mole Ag to a fine grain(02,) cubic silver bromoiodide gelatin emulsion which is gold and sulfursensitized and the emulsion is coated on cellulose acetate film supportat 400 mg. Ag/tt. and 400 mg. gelatin/ft an increase in blue speedWithout substantial spectral sensitization is observed.

